Method of manufacturing seats for butterfly valves



Nov. 22, 1,927. 1,650,265

c. v. Foums4 Original Filed Dec, 9, 1925 51 TTO'RNE Y Patented Nov. 22, 1927.

1,650,265 PATENT OFFICE.

CHARLES v. roULDs, or OAKLAND, cALIFonNIAjAs'sIGNoR fro THEPELTON WATER WHEEL co., or sAN FRANCISCO', oALrFoRNIAA coRPoRA'rIoN or cALIFoRNIA.`

f METHOD or MANUFACTURING SEATS Fon BUTTERFLYVALVES;

Y l Originalapplicationfiled December Y9, 1925, Scrial'No. 74,255. Divided and this application iiled August 16, 19.26.

`The present invention relates toimprovements -in butteriiy valves, and more particularly to a valve sea t and the method of manufacturing thefsame,l and isa division ofL mypendingapplication Seria-l Number 74,255, iiied December 9t-h,1925.v i

The: invention has for one of its objects to reduce to a minimum the cost of wearing rings of butterfly valves by an improved method o manufacturing the same; tov provide means for reducing to a minimum the leakage between the valve and seat when the valve is in closed position, thereby reducing the destructive wear on the edges of the valve and the surface of its seat. Another object is to provide means for compensating for such wear as may occur between the valve and seat thereby enabling the valve to be maintained tight over a long period of time, and eliminating or reducing to a minimum the necessity for frequent costly repairs or replacements.

`With the above mentioned and other objects in view, the invention consists in the novel construction and combinationof parts hereinafter described, illust-rated in the accompanying drawings, and set forth in the claims hereto appended, kit being understood that various changes inthe form, proportion, size and minor details of construction within the scopey of the claims may be resortedto without departing from the spirit or sacrificing any of the advan* tages of the invention. e

To comprehend the invention reference is directed toy the accompanying drawings wherein v Fig. 1 is a horizontal cross section of the preferred i'orm of` butterfly valvegillustratdrical formation, and2 a valve disk mount-V ed therein on a shaft 1 to pivot in bearings,

ling a metal to metal contact between they Serialv N0. 129,382.`

not shown, and carried at opposite points on the wall of the valve-body l. The inner wallk f of the body L is circumferentially grooved at l, andwit-hin the grooveare received circu-4 lar wearing rings 3 provided with oppositfely bevelled seats 4 and 4. The wearing rings are; constructed 'in the following manner;-

A ring, Fig. 2, shown also as part 3 Fig. l, of a diameter to snugly fit within the groove la is preferably machined in its entirety in one piece, the seating face of the ring 3 being conically tapered to produce, when cut on the line a-a, the valve periphery seats 4 and 4', Fig. 3. yAfter machining, the ring is out in halves on line -a, and one half reversed with respect tothe other, and the same are positioned Within the groove la, one half lying on either side ot the shaft 1,

and one half reversed by turning it through an arc of 180 degrees in respect to the other, thusV positioning the conical portion of the ring in parallel relation on opposite sides of the shaft l. The cutting of the ring on the line -a and the reversing of the cut halves, as above described, positions the conical seat 4 with face on the downstream side of the shaft center and the seat 4 with face on the upstream side of the shaftcenter, as clearly illustrated in Fig. 1. The rings are held in position by threaded studs 5 passing therethrough and engaging the base of the groove l.

To preclude leakage through the groove 1at there is preferably positioned a gasket 5 in the groove in the outer periphery of the ring, held by the adjustment of the studs 5 against the inner surface of the groove la.

In'the construction shown in Fi. l, adjustably carried by the valvev disk 2 is a disk or wearing ring 7 held to the valve disk byr studs 6. The periphery of the ring 7 is oppositely bevelled or tapered to seat against the seats 4 and 4 of the ring 3, and to precludeyleakage between the valve disk and the wearing ring 7 is a packing 8 secured by the studs 6.V The disk 2 is provided on one face with a center extension 6 receivable within an opening 62 in the center of the ring 7, the extension affording a guide for preventing the lateral movement of the ring relatively to the valve disk 2. In this construction, the rotating of the kbutterfly valve on its shaft causes a simultaneousseating of the opposite faces of the bevelled peripheral surface of the ring With the respective seats 4 and 4.

It Will be observed that the present structure illustrates a method of forming a valve seat whereby a single machined element when cut transversely and reversed .affords corresponding seat portions for disposal at opposite sides of the butterfly mounting Shaft. u

While a particular form or structure of butterfly valve has been illustrated in the present disclosure it is understood that any form of butterfly valve equipped with any peripheral packing, either separable or integral adapted for cooperating With the seat faces may be employed.

I claim Y 1. The method of making a bevelled seat ring for butteriy Valve structures which consists in forming a conical opening inY a one piece cylindrical ring, cutting the ring Vtransversely to provide duplicate ha lf sections, reversing the half. sections by turning the same on an axis of 180 degrees, and positioning their ends in opposing relation.

2.` The method of making a bevelled seat ring for butteriy valve structures which consists in forming a cylindrical ring, bevelling f Y the interior thereotl 1from one side to pro# vide a conical openlng, cutting the ring transversely to provide duplicate half seotions, reversing the half sections by turning the same on an axis of 180 degrees and positioning the ends in opposing relation. Y

In testimony'whereof I have signed my name to this specification.

CHARLES V. FOULDS. 

